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Finding the Fourth Proportional to 142.63, 196.49 and 135.68

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Solution

The fourth proportional to 142.63, 196.49 and 135.68 is: 186.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.63 : 196.49 = 135.68 : x
  2. Step 2: Convert to fraction form
    142.63/196.49 = 135.68/x
  3. Step 3: Cross multiply
    142.63x = 196.49 × 135.68
  4. Step 4: Simplify right side
    142.63x = 26,661.05
  5. Step 5: Solve for x
    x = 26,661.05/142.63
  6. Step 6: Final answer
    x = 186.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.